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// MIT License, Copyright (c) 2020 Marvin Borner
// Syscall implementation
#include <arg.h>
#include <errno.h>
#include <sys.h>
#if defined(userspace)
/**
* Definitions
*/
#define ERRIFY(ret) \
if (ret < 0) { \
errno = -ret; \
return -1; \
} \
return ret
int sys0(enum sys num)
{
int a;
__asm__ volatile("int $0x80" : "=a"(a) : "0"(num));
ERRIFY(a);
}
int sys1(enum sys num, int d1)
{
int a;
__asm__ volatile("int $0x80" : "=a"(a) : "0"(num), "b"((int)d1));
ERRIFY(a);
}
int sys2(enum sys num, int d1, int d2)
{
int a;
__asm__ volatile("int $0x80" : "=a"(a) : "0"(num), "b"((int)d1), "c"((int)d2));
ERRIFY(a);
}
int sys3(enum sys num, int d1, int d2, int d3)
{
int a;
__asm__ volatile("int $0x80"
: "=a"(a)
: "0"(num), "b"((int)d1), "c"((int)d2), "d"((int)d3));
ERRIFY(a);
}
int sys4(enum sys num, int d1, int d2, int d3, int d4)
{
int a;
__asm__ volatile("int $0x80"
: "=a"(a)
: "0"(num), "b"((int)d1), "c"((int)d2), "d"((int)d3), "S"((int)d4));
ERRIFY(a);
}
int sys5(enum sys num, int d1, int d2, int d3, int d4, int d5)
{
int a;
__asm__ volatile("int $0x80"
: "=a"(a)
: "0"(num), "b"((int)d1), "c"((int)d2), "d"((int)d3), "S"((int)d4),
"D"((int)d5));
ERRIFY(a);
}
int sysv(enum sys num, ...)
{
va_list ap;
int args[5];
va_start(ap, num);
for (int i = 0; i < 5; i++)
args[i] = va_arg(ap, int);
va_end(ap);
return sys5(num, args[0], args[1], args[2], args[3], args[4]);
}
#endif
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